18. Galactosemia is a recessive human disease that is treat- able by restricting lactose and glucose in the diet. Susan Smithers and her husband are both heterozy- gous for the galactosemia gene. a. Susan is pregnant with twins. If she has fraternal (nonidentical) twins, what is the probability both of the twins will be girls who have galactosemia? b. If the twins are identical, what is the probability that both will be girls and have galactosemia?

Human Anatomy & Physiology (11th Edition)
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Question 18 a and b Please show steps and explanation
18. Galactosemia is a recessive human disease that is treat-
able by restricting lactose and glucose in the diet.
Susan Smithers and her husband are both heterozy-
gous for the galactosemia gene.
a. Susan is pregnant with twins. If she has fraternal
(nonidentical) twins, what is the probability both
of the twins will be girls who have galactosemia?
b. If the twins are identical, what is the probability
that both will be girls and have galactosemia?
Transcribed Image Text:18. Galactosemia is a recessive human disease that is treat- able by restricting lactose and glucose in the diet. Susan Smithers and her husband are both heterozy- gous for the galactosemia gene. a. Susan is pregnant with twins. If she has fraternal (nonidentical) twins, what is the probability both of the twins will be girls who have galactosemia? b. If the twins are identical, what is the probability that both will be girls and have galactosemia?
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